Crunching H.264

Has anyone played with Wirecast? My organization uses it for live webcasting and concurrent recording for web archives. We're using a Canon VC-C4 Robotic Camera.

Problem: We'd like to be able to broadcast and simultaneously compress to three different formats [640 video, 320 video, and .mp3] for download. The computer we are using for the Wirecast, a Mac Mini, can't seem to crunch the two H.264's and the .mp3, and broadcast simultaneously. Any suggestions?